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Post by crwford on Dec 19, 2017 12:22:25 GMT -6
pull intake off look under neath there is a o ring make sure it is in good shape.
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Post by ellpee on Dec 20, 2017 8:43:48 GMT -6
pull intake off look under neath there is a o ring make sure it is in good shape. So you're talking about the hard rubber engine intake manifold, not the carb air intake. Okay, got it. If I find it's NOT in good shape, hope I can find a replacement somewhere in Tucson; I'm sure that would have to be an automotive, high-temperature ring, not just something from the Home Depot plumbing aisle. Will do that check soon, as it's still not starting, though every other time I get a couple putts out of it. UPDATE: O ring and gasket appear in good shape, as does the manifold itself. Am going to disconnect and reconnect everything and see what happens; no reason I can see that it would not start short of a bad CDI, but there may be some piddly little thing I missed or did wrong that is causing the problem. I got it running last spring after the Kymco shop could not, so I should be able to do it again! |
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Post by ellpee on Dec 23, 2017 9:11:53 GMT -6
Completely disassembled carb yet again and re-cleaned everything, put it back together, intake manifold, gasket, and both O-rings seem fine, gas is pumping, spark is sparking, so time to hook it all up again, cross my fingers and hit the start button. BTW, intake manifold and gasket don't appear to have had any kind of gasket cement on them. Should I maybe apply a little bit? At one time it ran fine the way it was, so maybe that's not necessary?
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Post by ellpee on Dec 24, 2017 11:26:45 GMT -6
This scooter is cursed! reassembling everything, all of a sudden the throttle cable doesn't work, handle just turns with no reaction at carb end. Likely no big deal, but for some reason this piece of Chinese junk seems to want to frustrate me at every turn. Merry Christmas to all anyway.
UPDATE: Throttle cable per se is okay, gizmo on the handlegrip that it hooks into broke, so new handlegrip needed. Looks like the Yamaha ones I see on the internet; if anybody can confirm, please do so. We do have a Yamaha dealer in Tucson so might be able to get one there, though they're only about $15-20 on line IF they're the correct one. Needs to match the left one if possible, of course, and might have to buy a pair in any case. Hope not.
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Post by cyborg on Dec 25, 2017 21:14:09 GMT -6
The throttle tube broke?
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Post by cyborg on Dec 25, 2017 21:15:02 GMT -6
Geez ,,,get that thing running and sell that turkey holy smokes
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Post by ellpee on Dec 26, 2017 11:54:00 GMT -6
No, the plastic or hard rubber part of the handle grip broke (after just 1700 miles!), cable is fine, new grip on order for another $20 and 7-10 days of waiting. Easy enough replacement after it arrives, and then the big test, will it even start after my exhaustive carb cleaning and other measures. Hope everybody on this forum even remotely considering a Chinese scoot is paying attention. I'm with The Donald about our market relationship to China: they are selling us really low end, cheap cr@p and making a ton of money. I know some out there are happy with their IceBear and other Chinese products, all I can say is count your blessings. For me, should I ever buy another scoot, US or Nippon all the way.
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Post by ellpee on Dec 31, 2017 9:52:24 GMT -6
So today's the day, everything put back together including the throttle grip. Will see if it fires up. But for anybody who owns a Magnum, Zodiac, or similar IceBear product with the 278cc Yamaha-clone engine, a question. Have asked it before but got no answers. The enricher has a wire harness coming off it, two wires out of the enricher, two-pin connector at the other end that plugs into an obvious receptacle on the main wiring harness. But halfway down the enricher harness another wire emerges, single bullet connector at the end, and I have no idea where that comes from or where it should plug in, if at all. Anybody who has one of these beasts, take a look and see if you can tell me what the heck I should do with that orphan third wire. Might literally be an orphan, not used on the Magnum, but stray stuff like that always makes me uneasy.
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Post by ellpee on Dec 31, 2017 13:31:07 GMT -6
Okay, no go on the scoot, but maybe a clue. On the left side of the installed carb there is a short overflow tube, just a couple inches long with a bend in it, connects to nothing at the output end. When I crank the scoot, gas quickly starts coming out of that tube, suggesting to me that the float chamber in the carb (which is BRAND NEW FROM RAPID JIM, remember) is filling to overflowing right at the git-go. Can't imagine that could be right. Googling suggests float level or needle valve problem, which I'll check, but how on earth does something like that start happening with a carb that has almost no miles on it and was working fine for several months?
UPDATE: Removed carb yet again and opened float chamber to examine floats and needle valve. Sprayed cleaner, compressed air, etc., everything looks okay as far as the needle valve is concerned. Blew into the fuel connection while I worked the floats up and down, seems to shut off properly as floats move up. So no idea why the overflow, except maybe the little metal tang on the floats needs to be bent ever so slightly to shut off the fuel a little sooner. Any thoughts welcome, don't want to get too aggressive and maybe break something or make the problem worse. Some on line stuff about adjusting carbs says to check the float height, but no idea what the correct height should be for this Magnum carb. Sure don't want to drop another $80-90 for yet another carb if it's something minor that I can fix myself.
UPDATE ON THE UPDATE: watched several YouTubes about adjusting floats, bent the tang slightly in the "leaner" direction, reassembled everything, cranked, nothing, not even a pop, although the almost immediate overflow situation was apparently resolved. Back to Square One, thinking I'll have to try yet another carb, or a CDI, or both, no idea how else to attack the problem. either one is around $80 -- grrrr. I see other Linhai CDI's on line cheaper, but they only fit up to 250cc, and my Magnum is a 278cc, not sure they would work. Only sure bet is RapidJim's at $85. What a way to start a new year.
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Post by ellpee on Jan 5, 2018 15:58:42 GMT -6
Go figure. Walked past it this afternoon and said what the hey. might as well give it another try. Lo and behold, it STARTED and ran as long as I gave it a little throttle. Ran rough though, and backfired a little when I accelerated, leading me to think messing repeatedly with the carb I may have gotten the mixture off in one direction or another. Googling gave me a whole list of possible causes for backfiring, some of them exactly opposite -- too rich vs. too lean, for example. Given all I've been doing to this scoot recently, anybody care to suggest which to suspect first? And BTW, I assume I can correct a mixture problem to a degree with the mixture screw rather than having to tear apart the carb again. Yes? No?
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Post by cyborg on Jan 6, 2018 20:14:34 GMT -6
Yes,,, get her running again turn the mixture screw in till it starts to stumble,,, turn it out 2.5 turns and you should be good to go
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Post by ellpee on Jan 10, 2018 17:19:25 GMT -6
Found a "mobile motorcycle repairs" guy on CraigsList, and he spent several hours trying to figure out my problem. Tweaked carburetor, etc., got it to start but not run smoothly no matter what he did with mixture, etc. Ultimately, after discovering gas was being sucked into the manifold from the fuel pump vacuum line, determined that the fuel pump itself was bad. Disconnecting that vacuum line, the Magnum ran smooth as butter, at least until the gas in the carb was exhausted. So am now ordering a new fuel pump, and hopefully after that it'll behave itself. Wondering how long that problem has existed, and why, with only 1700 miles. Guy said it looked like someone had opened up the pump and not reassembled it correctly .... I could believe that, considering the poor results I had with supposedly professional shops both in Tucson and in Ruidoso. Hope to heck that gets me up and running once and for all. Good news, apparently don't need yet another carb or a CDI, fuel pump is way, way cheaper.
Oh, a PS question. On two different carbs, we found that the enricher gets quite hot after the ignition has been on for awhile. I know heat is what makes it do its thing, but how hot to the touch is "normal"?
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Post by cyborg on Jan 10, 2018 23:30:31 GMT -6
Wow,, good find,,, that's a tough one,,, simular problem with a vacuum operated petcock,,, it had a pinhole in the diaphragm,,, and was dumping fuel into the intake manifold,,, i only run clear lines now i get from a motocross supply house and I also switched to manual valves on all my rides ,,, tired of chasing idiotic problems,, after I did that all of that kind of stuff went away
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Post by ellpee on Jan 11, 2018 15:25:44 GMT -6
Wow,, good find,,, that's a tough one,,, simular problem with a vacuum operated petcock,,, it had a pinhole in the diaphragm,,, and was dumping fuel into the intake manifold,,, i only run clear lines now i get from a motocross supply house and I also switched to manual valves on all my rides ,,, tired of chasing idiotic problems,, after I did that all of that kind of stuff went away Yeah, "checking the fuel system" would normally just be "does gas come out of the fuel line when I crank it?", and it passed that test repeatedly. Clear tubing is a good tip, may go that route too. Any thoughts about the hot enricher thing? Doesn't exactly blister your fingers, but quite hot short of that.He wondered about wrong electrical connection, but there's only one to be found, and no matter what it got connected to, can't think of anything that would do more than feed it 12v DC, which surely is what it needs. One of the two carbs had an enricher with an extra, third, wire that didn't appear to connect anywhere. Asked repeatedly about that here, never got an answer. |
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Post by cyborg on Jan 12, 2018 8:23:28 GMT -6
The enrichner has wax in it that's softened ,,,personally I'd run a manual cable "choke " and be done with it,,,trust me this isn't a Chinese specific thing,,,on my dr350,,there was a kickstand switch that would kill the engine if the stand was down,,so no start,,,,,,well guess what happens when you hit a bumpy section of trail way out in the boonies?,,,correct you hit a decent jump the stand moves down when you land and shuts off the engine right when you need it,,,maddening ,,,then there was the clutch lever switch,,,I went thru all my machines and got rid of any and all nanny switches,,,I can't stand those things,,,and all are switched to manual petcocks as well,,,I got tired of bsing around with that stuff,,,,but as a trade off there is a specific religious routine that I need to do so I can get going,,,but I'll take that over chasing mystery problems any day of the week,,,getting back to the enrichner thing ,,ALLYOOP switched his trike to manual and never looked back
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